Are you 100% sure that:
A) the player in question did in fact par the 1st hole, but got credit for a birdie.....and
B) you can prove that it was your opponent who caused this to happen.
Make certain that it wasn't a WGT error before publicly labelling a player as a cheat. Mistakes do happen occasionally (as hard as that may be to believe on here....lol).
Case in point: There were 70 players who temporarily received 50,000 credits each last night, due to a WGT error (it was very quickly corrected and the credits taken back).